package reflect;

import java.util.ArrayList;
import java.util.Scanner;

public class ReflectDemo2 {
    public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException {
        ArrayList list = new ArrayList();
        System.out.println(list);
        Class cls = Class.forName("java.util.ArrayList");
//cls.newInstance();这个方法要求类必须有一个无参构造函数，否则会抛出异常
        Object obj  = cls.newInstance();
        System.out.println(obj);

        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入类名");
        String className =scanner.nextLine();
        Class cls1 = Class.forName(className);
        Object obj1 =cls1.newInstance();
        System.out.println(obj1);



    }
}
